Improvement in porcelain blocks for dental fillings



Patented May 20, l873.

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CHARLES 11. MACK, on NEW YORK, N. Y.

IMPROVEMENT IN PORCELAIN BLOCKS FOR DENTAL .FILLINGS.

Specification forming part of Letters Patent No. 139,012, dated May 20,1873; application filed January 29; 1873.

To all whom it may concern:

Be it known that I, CHARLES H. MACK, of the city, county, and State ofNew York, have invented Porcelain Blocks for Dental Fillings in NaturalTeeth; and I- do hereby declare the following to be a full and exactdescription thereof, referencebeing had to the accompanyin g drawingmaking apart of this specification, in whicha represents the labialsurface of a tooth in which a cavity is to be filled. 1) represents theside and othe end of a porcelain block designed for a dental filling. dand 0 represent varied elongated forms of these blocks. f and g are sideviews of the same with bent platinuml pins for fastenings. h is sideview of block with end undercut for fastening.

The object of this invention is to furnish a durable material for dentalfillings which shall closely resemble the natural tooth structure, andalso to aid the dentist in his manipulations by having the porcelainblocks, as de scribed, formed in desirable and various patterns for hisconvenient use. The mode of applying and attaching these porcelainblocks is to first select a block the shape of which corresponds nearlywith the shape of the cavity to be filled. This block is to be closelyfitted to the cavity, when it will be ready for insertion andattachment. The block is secured within the cavity by means of any ofthevarious preparations of oxychloride of zinc, Cement Plombe, GuilloisCement,

Os Artificial, or other plastic material used for filling the naturalteeth. A little of either of these preparations, while at a properplastic or semi-fluid consistency, should be placed in the bottom andagainst the walls of the cavity. The porcelain block should beimmediately forced into the cavity and into the plastic cementpreviously placed there. In this way the cement is forced well into theunder-cuts and uneven surfaces of the porcelain block, and also aboutthe bent or headed plati num pins and when the cement becomes granulated(for which a very brief space of time is required) a most reliable andpermanent fastenin g is secured. After this the porcelain block may beground, finished, and polished even with the tooths surface, and theoperation is complete.

For dental fillings in labial surfaces which are frequently exposed toview, this mode of operating is especially desirable. By this we avoidthe unsightly glare of gold fillings often seen in the natural teeth.

Claim.

1 claim Porcelain blocks for dental fillings, when made and used in themanner described.

CHARLES H. MACK.

Witnesses WM. H. RIBLET, EMERY G. GoLLINs.

